CS101.Lect01.Introduction.ppt

CS101.Lect01.Introduction.ppt - CS101 Lecture 01: Computer...

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1 1 Aaron Stevens 6 September 2011 CS101 Lecture 01: Computer Science and Computers 2 What You’ll Learn Today – What is computer science? – What are data and information? – What is a computer? – What are hardware and software?
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2 3 What is Computer Science? 4 CS is NOT Science! The fundamental ideas of CS are: – Encoding Information – Algorithms – Protocols – Abstraction
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3 5 Flashlight Messaging Imagine you are 10 years old, in 1980. .. Your best friend lives next door. You want to send messages at night. You each have a flashlight. What do you do? 6 Easy as ABC, 123 13 5 5 20 13 5 1 20 19 20 1 18 2 21 3 11 19
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4 7 Numbered Code Replace each character with a number… Coded Message Example: 13 5 5 20 13 5 1 20 19 20 1 18 2 21 3 11 19 Encoding is about converting data into a coded form. Decoding is about converting from coded to normal form. 8 Algorithm An algorithm is a sequence of clear and precise step-by-step instructions for solving a problem in a Fnite amount of time.
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This note was uploaded on 12/16/2011 for the course CS 101 taught by Professor Stevens during the Fall '08 term at BU.

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CS101.Lect01.Introduction.ppt - CS101 Lecture 01: Computer...

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